Tag: Sedimentology

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Paleo-environmental controls on the rise and fall of the Ediacaran Biota


The Ediacaran biota pose a riddle that scientists have grappled with for decades. Found in three distinct biotic assemblages – the Avalon (575–560 million years ago; Ma), White Sea (560–550 Ma), and Nama (550–539 Ma) – these peculiar Ediacaran organisms may hold the key to unlocking the secrets of early animal evolution. Conventional studies tie diversity and ecological changes across these assemblages to biological radiation and extinction events. Can a closer look at the preserved paleo-environments that contain the fossils, using our sedimentology and stratigraphy toolkit, offer a fresh perspective?

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Exploring the environments inhabited by Earth’s earliest animals in Namibia

Fossils of the Earth’s earliest animals appear abruptly in the geological record ~574 million years ago (Mya), and then suffer a mysterious decline in diversity just a few million years later ~550 Mya. Some researchers consider this biological change to be Earth’s first mass extinction event.

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